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Debt - Lease and Franchisee Guarantees (Details)
$ in Millions
12 Months Ended
Sep. 30, 2025
USD ($)
Property Lease Guarantee  
Guarantor Obligations [Line Items]  
Undiscounted maximum potential future payments under guarantees $ 63.8
Financial Guarantee  
Guarantor Obligations [Line Items]  
Undiscounted maximum potential future payments under guarantees $ 12.4
Minimum | Property Lease Guarantee  
Guarantor Obligations [Line Items]  
Guarantor obligation term 3 months
Minimum | Financial Guarantee  
Guarantor Obligations [Line Items]  
Guarantor obligation term 1 year
Maximum | Property Lease Guarantee  
Guarantor Obligations [Line Items]  
Guarantor obligation term 15 years
Maximum | Financial Guarantee  
Guarantor Obligations [Line Items]  
Guarantor obligation term 5 years